Condenser



March 31, 1931. G. F. BHPQM@ CONDENSER UUUUUUUD U DDG March 31, 1931. cs. F. BEHmNGER CONDENSER Filed June 20, 1929 2 SheetS-Sheet INVENTOR. G. F Behringer( BY QJ A TTORNEY.

Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE I GROVER F. BEHRINGER, OF DEFIANCE, OHIO,

OF DEFIANCE, OHIO, A CORPORATION OF OHIO PACKAGE COMPANY,

ASSIGNOR TO THE `AINIERICAN STEEL CONDENSER Application led June 20,

This invention relates to improvements in radio condensers, facilitating the assembly thereof and perfecting certain of the structural details to simplify the device. In one respect the invention deals with an advantageous mounting for the stator plates of the condenser.

A further object deals with the association of plates interposed between the stator sections and grounded to the frame. These plates simulate the end members of the frame and efectually equalize the fixed capacity of all stator sections thereby providing a uniformity of iixed capacity between the several units of a gang condenser assembly which uniformity of fixed capacity could not be present if these plates were not interposed between the stator sections.

A further purpose of this plate is to provide a means of mounting a resilient spring contact, engaging with the rotor shaft and providing individual and separate paths for the flow of current to and from each individual section of the rotor assembly.

An additional purpose of this plate is to provide a means of readily attaching to the variable gang condenser a series of secondary or compensating condensers the purpose of which is to balance any inequalities of capacity in the several circuits, external to the variable condenser, so that simultaneous equal change in capacity of the several circuits by means of the variable gang condenser will result in the same percentage change of capacity in the several circuits and maintain a condition of resonance therebetween.

One of the consequent objects of my invention is to provide a means of interchangeability whereby this secondary or compensating condenser assembly can readily be mounted on either side of the gang condenser. The merit of this provision will be apparent to anyone familiar with the art.

Another object of my invention is to provide for mounting the compensator in such manner that the attachment which locks the compensator in position serves at the same time to provide an electrical connection under spring pressure between thevariable element of the compensating condenser or ca- 1929. Serial No. 372,458.

pacity and that portion of the device upon which the compensating element is mounted.

It is also a purpose of my invention to pro- Vide for mounting this secondary or compensating condenser in such relation to the gang condenser that when mounted in the usual position, as illustrated in the appended drawings, it will provide a stop for the rotor assembly at the point of minimum capacity.

As it is sometimes necessary that both elements of one or more of the secondary or compensating condensers be of a potential different from that of the rotor assembly of the variable gang condenser this invention provides a means for accomplishing this condii the line 3-3 of Fig. 2;

Fig. 4 is a rear elevation of the compensator;

Fig. 5 is an enlarged vertical section taken on the line 5 5, of Fig. 4;

Fig. 6 is a fragmentary side elevation of thei compensator bar and associated parts an Fig. 7 is a perspective view of the stationary`plate of the compensator unit.

or purposes of illustration I have shown my device to include a U-shaped frame 1 having a front end 2 and rear 3. The ends 2 and 3 have bearings 4, 4 in which are mounted a rot-or shaft 5.

The rotor shaft 5 has a series of grooved conducting sections 6, 6 which serve to receive and hold in frictional engagement a series of rotor plates 7, 7. All but one of the lates 7 are bound together in each section by t e cross bar 8. The end plate 9 of each section is not attached but forms a differential adjustment for the capacity in a manner well understood y the ends 2 and 3 of. the frame and are held tightly against the rear 3 by'means of lock nuts 12,12. Each bolt 11 carries a series of insulating stepped collars 13,13 which are heldv in place bymeans of adjusting nuts 14, 14. The insulating collars 13, 13 in turn form a support for the ribbed sleeve 15 upon which the stator plates 16 are mounted frictionally in the usual way, with one plate held between each separate pair of ribs. y

Between each stator section 17, 17 there is mounted avplate 18 on frame 1. This plate, provided for the purposes heretofore eX- plained, is illustrated cut out at'the top to it into corresponding grooves in the rotor shaft 5 to position it accurately centrally between the stator sections and prohibit any departure from this central position which Would result in unbalancing of the fixed capacities of the stator units.

One form of a resilient spring contact 5, between plate 18 and rotor shaft 5 is illustrated in Figs. 1 and 2.and it is apparent that this device can be any form which eliectually attains the desired result and that it may e provided with terminal lugs to which the conductors from the several circuits may be directly attached.

Lugs 19 extend from each side of plates 18 and these lugs are slotted, as at 20, to provide an anchorage for the secondary or compensating condenserassembly and said lugs further provide a means of contact or electrical connection between the variable element of the compensating condensers and the rotor element of the variable gang condenser.

Terminal lugs 20', 20 are provided at each end of the stator for the convenience in making connections to the latter.

By reason of mounting the compensator devices in the manner above described it will be possible to use them as limit stops for the rotor in its position of minimum capacity as will be apparent from the following description. l

The compensator denoted generally by the numeral 21 consists of a bar, plate or the like 22 made of non-conducting material such as indurated fiber or composition which shall lhave appropriate electrical characteristics.

This bar 22 is notched on its upper and lower edges as shown at 23 to form supports v for the stationary plate ofthe compensator unit.

A series of transverse slots 24, 24 are made in the bar 22 at distances corresponding to distances between adjacent fixed plates 18, 18. These slots 24 serve to receive the lugs 19, 19 ofthe fixed plates and thus support the bar 22 thereon. On each side of slot 24 there is provided a similar transverse slot25, 25 which is used in the mounting of the movable plate of the compensator unit. The bar 22 carries a series of adjustable screws 26, 26

by which the movable plate of the compensator is placed in accurate adjustment with respect to the stationary plate.

The stationary plate of the compensator unit consists of a sheet of foil or other metallic conductor such as copper, bronze and the like as shown in perspective in Fi 7 and denoted generally by the numeral 2 This foil has a central aperture 28 insulating it from the adjusting screw 26. One end 29 is bent over the upper notch 23 and has a tab 30 extending downwardly on the inner side of the bar v22. The lower end of member 27 has an inward extension 31 terminating in a bifurcated end or fingers 32 which in their inal position rest firmly against theend of the stator section.

A strip of dielectric material 33 is provided to lie against the outer surface of the bar 22 and over the mid portion of the plate 27. This strip 33 is slotted as at 34 to correspond with the slots 24 and 25 in the bar 22.

The variable plate of the compensator consists of a sheet 35 generally rectangular and composed of resilient conducting metal or alloy. In size and shape it corresponds to the mid-portion of element 27 over which it extends. One end of this spring plate has a rolled edge 36 best shown in Fig. 2 and which serves to rest as a fulcrum against the dielectric strip 33,

The rolled edge 36 is folded back upon itself to provide the anchoring rib 37 which in turn terminates in the locking end 38. This end 38 iits'within the slot in the lug 19 of the plate 18.

In assembling this device the compensator is built up by attaching the stationary plates 27 to the bar 22 and by placing the dielectric strip 33 over the outer side of the bar 22. These parts are then mounted on whichever side of the shielding plates 18, 18 is selected and the lugs 19, 19 brought through the slots 24. The ends 38, 38 of the spring plates 35 are then locked within the slots in the lugs 19 and screws 26 tightened in order to anchor the rib 37 in slots 25, 25. Normally the compensator will be mounted on that side of the stator upon which the rotor plates overhang when in the position of minimum capacity and thus the bar 22 serves as a limit stop to prevent excessive movement of the rotor plate.

The adjusting screws 26 are then turned up to the degree desired to compensate for any variations of capacity in the circuits external to the condenser.

As has been shown in Figs.`1 and 2, the left hand compensator unit has the end 38 bent back upon the rib 37 and thus out of contact with lug 19. In this manner the spring plate 35 is free from electrical con-- tact with the plate 18.. This forms a desirable feature in certain circuit arrangements and it will be apparent' that this particular form of spring plate may be inserted in Whichever unit it is most desirable and that connection thereto may be made by soldering or otherwisel attaching a conductor directly to the stationary end 38.

The above shows oneform of my invention but is to be understood as merely typical of the ideas. It will be apparent that many changes in proportions or in minor details may be made Within the scope of the appended claims.

`What I claim is:

l. In combination, a condenser having a frame, a revoluble shaft, a rotor thereon, a stator comprising plates and sleeves for holding the same, frame members passing through the sleeves, insulating elements supporting the sleeves on the frame members and means for adjustably positioning the insulating elements on the frame members.

2. In combination, a frame, a series of condenser units each comprising a stator on the frame and a grooved revoluble shaft. with rotors thereon, a plate mounted on the frame between two condenser units, said plate extending into a groove of the shaft and resilient means for electrically connecting the plate to the shaft.

3. In combination, a condenser having a frame, a stator, a revoluble shaft, a rotor thereon, an auxiliary condenser and means on each side of the stator for selectively mounting said auxiliary condenser.

4. In combination, a condenser having a frame, 'a stator mounted thereon, a revoluble shaft, a rotor thereon, fixed plates also mounted directly on the frame adjacent the stator, a compensating member and means for mounting the member on the fixed plates.

5. A variable capacity consisting of a slotted base bar, a metallic plate mounted thereon, a dielectric strip over the bar and plate,

a resilient plate having a fulcrum on the f strip and a free portion extending rearwardly rom said fulcrum and anchored in the slot of the base bar and adjusting means for the resilient plate.

6. A variable capacity consisting of a slotted base bar, a metallic plate mounted there- -on, a dielectric strip over the bar and plate,

a resilient plate having a fulcrum on the strip, and a free portion extending rearwardly from said fulcrum and anchored in the slot of the base bar, the 'end of the plate being held in fixed position and adjusting means for the resilient plate.

7. A variable capacity consisting of a slotted base bar, a metallic plate mounted thereon, a dielectric strip over the bar and plate, a resilient piate having a rolled edge in contact with the strip, a free portion of the plate extending rearwardly from said rolled edge and having an anchoring rib in a slot of the base bar and a locking end, and means for' adjusting the distance between said plates. 8. In combination, a gang condenser hav-- ing a frame, stator sections, supports therefor, a revoluble shaft, rotor sections thereon, a non-conducting bar mounted parallel to the ends'of the stator sections and independent of said supports, and a unit of variable capacity carried by the bar opposite each stator section.

9. In combination, a gang condenser having a frame, stator sections, supports therefor, a revoluble shaft, rotor sections thereon, fixed plates between the stator sections, a, non-conducting bar mounted on the ends of the fixed plates and separately from the frame and stator sections and a unit of variable capacity carried by the bar opposite each stator section.

l0. In combination, a gang condenser having a frame, stator sections, supports therefor, a revoluble shaft, rotor sections thereon, fixed plates between the stator sections, a non-conducting bar mounted on the ends of the fixed plates and separately from the supports for the stator sections, and a unit of variable capacity electrically connected to each of the fixed plates.

1l. In combination, a gang condenser having a frame, stator sections, supports therefor, a revoluble shaft, rotor sections thereon,.- fixed plates between the stator sections, a non-conducting bar mounted on the ends of the fixed plates separately from the supports for the stator sections, and carrying a unit of variable capacity having its fixed element in Contact with a stator and its variable element in contact with a fixed plate.

In testimony whereof, I have hereunto subscribed my name.

GROVER F. BEHRINGER. 

